120mm Knauf FactoryClad Roll 40 (Uncut) 9.4m x 1.2m - 11.28m2 per roll
120mm Knauf FactoryClad Roll 40 is a glass mineral wool insulation roll for built-up metal roof and wall systems, and the only 120mm roll in the FactoryClad family. The 32 grade is made in 80mm alone, and the 35 grade steps from 100mm straight to 140mm, so where a specification asks for 120mm of cladding quilt the 40 grade is the one that answers it. The setting is steel-framed industrial, commercial and agricultural buildings, with the roll held in the cavity between the inner liner sheet and the outer profiled weather sheet. Each roll measures 9.40m by 1200mm and covers 11.28m², with 24 rolls to a pallet for 270.72m². A declared thermal conductivity of 0.040 W/mK produces a thermal resistance of exactly 3.00 m²K/W at this depth, and water vapour resistivity is 5.00 MNs/g.m. Published embodied carbon sits at 1.04 kgCO2e/m² across stages A1 to A3 and 1.38 kgCO2e/m² across A1 to C4. What a quilt does at its joints decides whether a build-up performs the way it was calculated. Rolls of glass mineral wool knit into one another and take up slight irregularities in the liner sheet instead of bridging them, and they hold that contact as the frame settles and moves. Rigid insulation cannot do this: it either fits or it leaves a void, and voids are where a designed U-value quietly disappears. At 120mm the quilt is also compressed and released as it passes each bracket, and recovering afterwards is part of what keeps the layer continuous. Installation runs in the usual sequence: liner sheet fixed, quilt laid over it, spacer system brought up, outer sheet fixed, all to Knauf Insulation's guidance and the cladding system manufacturer's details. Spacer height and fixing lengths want confirming against 120mm before ordering, since this depth generally needs the bracket schedule looked at rather than assumed. It suits new-build twin-skin roofs and walls, standing seam roofs, and re-cladding work where the target U-value has moved on from whatever the original build-up could reach. Have the U-value calculated for the actual system to BS EN ISO 6946:2017 or BS EN ISO 10211:2017, using BR443:2019, rather than working back from the roll. Key Benefits of Knauf FactoryClad Roll 40: Thermal resistance of exactly 3.00 m²K/W at 120mm. The only 120mm option across the FactoryClad Roll 32, 35 and 40 grades. Declared thermal conductivity of 0.040 W/mK. Non-combustible, Euroclass A1 to BS EN 13501-1. 11.28m² per roll, and 270.72m² per pallet across 24 rolls. Knits at the joints and takes up substrate irregularities, limiting air gaps through the layer. Sound absorbent behind metal liner sheets, reducing internal reverberation. 1200mm width matched to commonly used rail and bracket spacer systems. Published embodied carbon of 1.04 kgCO2e/m² across stages A1 to A3. Bound with ECOSE® Technology, free of added formaldehyde and phenol. Rot proof and non-hygroscopic, and will not sustain vermin or support mould growth. Good to know: Only made in the 40 grade: FactoryClad Roll 32 comes in 80mm and Roll 35 runs 60, 100, 140, 180 and 220mm, so 120mm is available from Roll 40 alone. Check the spacer system before ordering: bracket height and fixing lengths need to suit 120mm, not the depth the building was originally clad to. Built-up metal construction only: this is not a loft, timber frame or masonry cavity product. The 40 in the name is a lambda grade referring to 0.040 W/mK, not a thickness. Supplied uncut at 9.40m per roll and unfaced on both sides. Keep it dry, flat, off the ground and under cover, and re-cover any pack that has been opened. Euroclass A1 non-combustibility may bear on the insurance position against foam composite panels. Check with the insurer for the building concerned. Where the specification asks for 120mm, FactoryClad Roll 40 is the only roll in the family that answers it, and it does so at a clean 3.00 m²K/W with A1 non-combustibility behind it.